Pipe-clevis.



P. MAGINNIS &-J. NELSON.

PIPE CLEVIS.

APPLICATION FILED OCT. 3. 1914-".

Patented June 13,- 1916.

n r nip.

PIPE-CLEVIS.

Specification of Letters Patent. Patenteflfl' n 13, 11916,

Application filed October 3, 1914. Serial No. 864,851.

To all whom it may concern Be it known that we, PATRICK MAGINNIs and J01in NELSON, citizens of the United States of America, and residents ofKim ball, in the county of Kimball, State of Nebraska, and Potter, inthe county of Cheyenne, State of Nebraska, respectively,

have invented certain new and useful Improvements in Pipe-Clevises, ofwhich the following is a specification.

This invention relates to pipe clevises, the said invention relatingparticularly to means for drawing a pipe from a well or the like, thesaid invention having for its object the provision of novel means forgripping the pipe, in which the gripping action or the frictionalcontact between the jaws of the gripper increases with the force applied to the elevis for withdrawing the pipe. In other words, theholding action of the clevis is increased proportional to the force orpull exerted for withdrawing a pipe.

A further object of the present invention is to provit e novel means forautomatically releasing the grip on the pipe when a pull or force isremoved from the body of the clevis, thus permitting the said clevis tofall by gravity to a lower position on a pipe so that it may take a newhold as the pipe drawing mechanism is operated or manipulated.

With the foregoing and other objects in view, the invention consists inthe details of construction, and in the arrangement and combination ofparts to be hereinafter more fully set forth and claimed.

In describing the invention in detail, reference will he had to theaccompanying drawings forming part of this specification wherein likecharacters denote corresponding parts in the several views, and inwhich- Figure 1 illustrates a view in perspec tive of a clevis embodyingthe invention; 2 illustrates a side elevation thereof applied to afragment of a pipe; and Fig. 3 illustrates a view on the line 38 of Fig.2.

In these drawings, we have illustrated an embodiment of the invention ascomprising an integral structure in so far as the body is concerned, thesame including an upwardly extending loop 4; to which the lifting hook 5may be applied, the said loop portion 4 having at its lower end aforwardly extending loop 6 and rearwardly extending heel portions 7, thelatter of which have recesses forming seats for the trunnions 9 of a dog10, the said dog having its jaw out to a ii-shape as shown at 11, andthe surface thereof serrated to augment the biting or clamping action ofthe dog with respect to the loop portion 6 of the body, it beingunderstood that the pipe 12 shown in dotted lines is run through theloop of the body and in position to be engaged by the dog so that thedog acts in conjunction with the inner surface of the body constitutingthe loop portion to grip a pipe and raise it from a well, or forotherwise moving said pipe.

Owing to the fact that the body is preferably formed of flat metal, theelevis can be made comparatively light, yet be capable of withstandingunusual strain, owing to the fact that the thickness of the metal may beminimized so that the strain incident to the use of the clevis will besustained at points where it is greatest.

As a means for increasing the frictional contact between the dog and theforward loop of the body, the upwardly extending loop is offset from thepipe, the offset portion being indicated at 13 so that when pull isexerted on the hook 5, there will be a tendency to tilt the body of theclevis with relation to the pipe. As a means for increasing the strengthof the body of the clevis, beads 1% are produced on the externalsurfaces of the vertically disclosed as well as on the forwardlyextending loops.

' e claim- In a clevis, a body comprising a forwardly extending loopportion, and rearwardly extending heel portions, the latter havingrecesses in the upper surfaces thereof, dog having integral trunnionsseated in the recesses, a vertically extending loop portion integralwith the body, and disposed substantially eentrally thereof, and saidvertically extending loop portion having an offset portion to provide aclearance for a lifting means.

In testimony whereof, we hereunto affix our signatures in the presenceof two witnesses.

PATRICK MAGINNIS. JOHN NELSON.

Witnesses:

Geo. L. Voonnn, L. W. LARSON.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. 0.

